/// <summary>
/// Instantiates a mesh object inside cpp plugin and stores
/// a reference to it in this class
/// </summary>
private void SendSkinnedMesh()
{
// The plugin will want to modify the vertex buffer -- on many platforms
// for that to work we have to mark mesh as "dynamic" (which makes the buffers CPU writable --
// by default they are immutable and only GPU-readable).
mesh.MarkDynamic();
var vertices = mesh.vertices; // Vector3[]
var faces = mesh.triangles.Clone() as int[]; // int[]
var nativeWeights = mesh.GetAllBoneWeights(); // NativeArray<BoneWeight1>
var boneCounts = mesh.GetBonesPerVertex().ToArray(); // byte[]
Debug.Assert(boneCounts.Length == vertices.Length, "Bone per vertex array has different length from vertex array");
// copy because original struct is not interop-friendly
int largestBoneIndex = 0;
Bone[] weights = new Bone[nativeWeights.Length];
for (int i = 0; i < weights.Length; i++)
{
var native = nativeWeights[i];
weights[i] = new Bone(native.boneIndex, native.weight);
largestBoneIndex = native.boneIndex > largestBoneIndex
? native.boneIndex : largestBoneIndex;
}
Debug.Log($"Largest bone index in mesh {mesh.name}: {largestBoneIndex}");
GCHandle gcVertices = GCHandle.Alloc(vertices, GCHandleType.Pinned);
GCHandle gcFaces = GCHandle.Alloc(faces, GCHandleType.Pinned);
GCHandle gcWeights = GCHandle.Alloc(weights, GCHandleType.Pinned);
GCHandle gcBoneCounts = GCHandle.Alloc(boneCounts, GCHandleType.Pinned);
var cppMesh = NativeInterface.CreateMesh(gcVertices.AddrOfPinnedObject(), mesh.vertexCount,
gcFaces.AddrOfPinnedObject(), faces.Length / 3,
gcWeights.AddrOfPinnedObject(), gcBoneCounts.AddrOfPinnedObject(),
largestBoneIndex + 1);
gcVertices.Free();
gcFaces.Free();
gcWeights.Free();
gcBoneCounts.Free();
string errorMessage = ExtractFailureMessage(NativeInterface.HasFailedMeshConstruction(cppMesh));
if (errorMessage.Equals(""))
{
this._cppMesh = cppMesh;
}
else
{
NativeInterface.DestroyMesh(cppMesh);
throw new Exception(errorMessage);
}
// send pointer to the mesh buffer
// if (mesh.vertexBufferCount > 1)
// Debug.LogWarning("There are more than one vertex buffer: " + mesh.vertexBufferCount);
// NativeInterface.SetMeshVertexBuffer(this._cppMesh, mesh.GetNativeVertexBufferPtr(0));
}